Heavier rainfall puts sewers and streets under pressure. Disconnecting rainwater in public space and capturing it in greenery buffers water locally: less flooding now, more groundwater in dry summers. The benefits stack up: avoided damage and sewer costs, a more pleasant living environment and better infiltration.
This task is part of one coherent green-blue package of measures that delivers a model neighbourhood around €2.5 million in societal value against €1.3 million in costs, shared across five climate tasks (investment €140,000–€285,000 per hectare). Source: Transform Zuid-Holland.